Abstract
The kinetics of α ⇔ β phase transformations in a Ti–4.4 mass% Ta–1.9 mass% Nb alloy has been studied as a function of heating and cooling rates in the range of 3–99 °C min−1 using isochronal differential scanning calorimetry. The transformation start (Ts), peak (Tp) and finish (Tf) temperatures show a systematic variation with heating and cooling rates resulting in a kinetic widening of the α + β phase field. The α ⇔ β phase transformation kinetics is modeled using standard non-isothermal Kolmogorov–Johnson–Mehl–Avrami (KJMA) model for diffusional phase transformation in order to evaluate the effective activation energy and transformation exponent, based on which the mechanism of α → β transformation is identified as diffusion controlled, while the reverse transformation is interface controlled. Based on the thermo-kinetic parameters determined, continuous heating (CHT) and cooling (CCT) diagrams for this alloy have been generated. Being a developmental alloy, the thermo-kinetic data provide useful inputs for the selection of process parameters during manufacturing and heat treatments.
Published Version
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